Dorado. An overview of the largest oil discovery on the NW shelf in the last 30 years

Ian CockerillHead of Geoscience

Top global conventional discoveries of 2018 / 2019

W Messoyakha187 Mmboe

Triton200 Mmboe

N Obskoye935 Mmboe

Hades / Idris191 Mmboe

Calypso672 Mmboe

Guyana Discoveries2071 Mmboe

Guanxuma130 Mmboe

Dover183 Mmboe

Ballymore546 Mmboe

Mabrouk NE671 Mmboe

Dorado283 Mmboe

Brulpadda1000 Mmboe

KBD-2X333 Mmboe

A neglected bit in the middle

1000km1000km1000km

Dorado

Browse

NorthCarnarvon

Bedout Sub-basin

Dorado

500km

And an unfashionable bit of stratigraphy

Roebuck Basin stratigraphy(Geoscience Australia)

Bedout Sub-basin stratigraphy (Minken et al 2018)

HOVE UNCONFORMITY

Australian North West Shelf big hitting plays

Mungaroo

North Rankin

Plover

Brewster

Barrow

DoradoRocPhoenix South

PhoenixPhoenix South

DoradoRoc

Phoenix South

Lower Keraudren

Bedout hydrocarbon occurrences

Bedout High wells – Permian volcanic centre.

Keraudren-1 – Middle Triassic ‘Keraudren Formation’ with excellent quality reservoir.

Poissonnier-1 and Bruce-1 – Triassic oil shows on the basin bounding fault system.

Bedout exploration history - 1970’s

1980 1990 2000 2010

1970’sBase Triassic depth structure map (m)

50kmLAMBERT SHELF

Poissonnier 1

Bruce 1

BEDOUT HIGH

BEAGLESUB-BASIN

BEDOUTSUB-BASIN

Keraudren 1

Depuch 1

Picard 1

Minilya 1 Bedout 1

BP Phoenix discoveries. Interpreted as tight gas in a distal deltaic setting.

Bedout exploration history - Early 1980’s

1980 1990 2000 2010

Early 1980’sBase Triassic depth structure map (m)

50kmLAMBERT SHELF

Poissonnier 1

Bruce 1

BEDOUT HIGH

BEAGLESUB-BASIN

BEDOUTSUB-BASIN

Keraudren 1North Turtle 1

Depuch 1

Picard 1

Phoenix 2

Phoenix 1

Minilya 1 Lagrange 1Bedout 1

Early 1980’s

1980 1990 2000 2010

Base Triassic depth structure map (m)

50km

Increasing condensate with depth.Potential for deeper liquids?

Bedout exploration history - Early 1980’s

LAMBERT SHELF

Poissonnier 1

Bruce 1

BEDOUT HIGH

BEAGLESUB-BASIN

BEDOUTSUB-BASIN

Keraudren 1North Turtle 1

Depuch 1

Picard 1

Phoenix 2

Phoenix 1

Minilya 1 Lagrange 1Bedout 1

Early 1990’sBeagle Sub-basin Jurassic exploration.

Nebo Oxfordian Calypso Formation oil discovery.

Bedout exploration history - Early 1990’s

1980 1990 2000 2010

LAMBERT SHELF

Base Triassic depth structure map (m)

50km

Poissonnier 1

Bruce 1

BEDOUT HIGH

BEAGLESUB-BASIN

BEDOUTSUB-BASIN

Keraudren 1North Turtle 1

Depuch 1

Picard 1

Phoenix 2

Phoenix 1

Minilya 1 Lagrange 1Bedout 1

Darwin 1

Cimba 1

Nebo 1Halo 1

Huascaran 1

BeagleMC3D

Recoverable Oil 12 MMbbls (2C)

Bedout Sub-basin acreage awarded to Carnarvon/Finder in the 2008 area release after a 30 year gap in Bedout Sub-basin exploration!

Phoenix 3D acquired.Apache / JX farmed in for two wells.

2014 - Oil discovered at Phoenix South-1 in the Barret sandstones.

2015 – Gas-condensate discovered at Roc-1 in the Caley sandstones.

Phoenix wells reinterpreted as oil.

Bedout exploration history - Mid 2010’s

1980 1990 2000 2010

LAMBERT SHELF

Base Triassic depth structure map (m)

50km

Mid 2010’sBEDOUT HIGH

BEAGLESUB-BASIN

BEDOUTSUB-BASIN

Base Triassic depth structure map (m)

Keraudren 1

Poissonnier 1

Bruce 1

North Turtle 1

Depuch 1

Picard 1

Phoenix 2

Phoenix 1

Minilya 1 Lagrange 1Bedout 1

Roc 1

Phoenix South 1

Darwin 1

Cimba 1

Nebo 1Halo 1

Huascaran 1

BeagleMC3D

Polly3D

ZeesterMC3D

Phoenix3D

2015 onwardsCapreolus multi-client 3D acquired.

Roc-2 appraisal well confirms high quality reservoir in the Caley and excellent quality seal in the overlying Hove.

Phoenix South-2 and -3 appraisal wells(tight reservoir).

Dorado Canyon identified up-dip of Roc as a potential trapping mechanism at Dorado.

Bedout exploration history - 2015 onwards

1980 1990 2000 2010

BEDOUT HIGH

BEAGLESUB-BASIN

BEDOUTSUB-BASIN

LAMBERT SHELF

Base Triassic depth structure map (m)

50km

Keraudren 1

Poissonnier 1

Bruce 1

North Turtle 1

Depuch 1

Picard 1

Phoenix 2

Phoenix 1

Minilya 1 Lagrange 1Bedout 1

Dorado 1

Roc 1

Roc 2

Phoenix South 1Phoenix South 2

Phoenix South 3

Darwin 1

Cimba 1

Nebo 1Halo 1

Huascaran 1

BeagleMC3D

Polly3D

CapreolusMC3D

ZeesterMC3D

Phoenix3D

DORADOCANYON

2018 Dorado discovery.

Lower Keraudren Delta – oil and gas accumulations

Roc-1 Roc-2 Dorado-1Phoenix South

DORADOCANYON

-2-3

Reported oil and gas occurrences

Oil

Condensate

Gas

-1

HOVE

CALEY

BARRET

HUXLEY

MILNE

CRESPIN

BAXTER

CALEY

MILNE

CALEY

N S

Image courtesy of TGS, Santos, and Carnarvon Petroleum

Dorado-1

132m total net pay13-20%porosity

Image courtesy of TGS, Santos, and Carnarvon Petroleum

Caley Member 96.1m gross79.6m net

2019

Bedout 2019 activity

1980 1990 2000 2010

BEDOUT HIGH

BEAGLESUB-BASIN

BEDOUTSUB-BASIN

LAMBERT SHELF

Base Triassic depth structure map (m)

50km

Keraudren 1

Poissonnier 1

Bruce 1

North Turtle 1

Depuch 1

Picard 1

Phoenix 2

Phoenix 1

Minilya 1 Lagrange 1Bedout 1

Dorado 1

Roc 1

Roc 2

Phoenix South 1Phoenix South 2

Phoenix South 3

Darwin 1

Cimba 1

Nebo 1Halo 1

Huascaran 1

BeagleMC3D

Polly3D

CapreolusMC3D

ZeesterMC3D

Phoenix3D

DORADOCANYON

Dorado 2Dorado 3 Roc South 1

Keraudren3D

Dorado-2 and Dorado-3 appraisal wells.

Roc South-1 exploration well.

Keraudren 3D seismic survey.

Caley Member (Roc-2 core)

Roc-2 chemostratigraphy (Minken et al 2018)

• Distributary channel sandbars and restricted lagoonal facies indicative of a deltaic environment.

• Good quality source rock interbedded within the Caley reservoir, thermally mature at the present day.

• Hove is a marine transgressive shale.

Roc-2 Caley core Roc-2 Caley core

HOVE UNCONFORMITY

Caley palaeogeography interpretation

100km

Comparison of Capreolus 3D to legacy 2D data over Dorado

2.0

3.0

Dorado gas chimney?

AttributeDoradoCanyon

Perth Canyon

Canyon length 120 km 145 km

Canyon width (at the shelf break) 15 km 16 km

Water depth at the shelf break (canyon shoulder)

(500 m> estimated)

850m

Water depth at the shelf break(canyon bottom)

(1500 m> estimated)

2300 m

Canyon incision depth(1000 m>

estimated)1450 m

Analogues to the Dorado Canyon

Perth Canyon

Dorado(analogous

location)

Dorado-1 Roc-1 Roc-2

Roc Southprospect

NNW 5km

Dorado Canyon

20km

The Dorado Canyon and the Caley shelf edge

Base Triassic depth structure map (m)

50km

Keraudren 1

Poissonnier 1Bruce 1

North Turtle 1

Depuch 1

Picard 1

Phoenix 2

Phoenix 1

Dorado 1

Roc 1 Roc 2

Phoenix South 1Phoenix South 2

Phoenix South 3

Darwin 1

Cimba 1

Nebo 1Halo 1

Huascaran 1

Dorado Canyon

Caley shelf edge eroded at the Caley-Hove unconformity

Caley shelfprospects

Base Triassic

Transgressive Hove shale

Caley-Hoveunconformity

NESW

Caley shelf edge eroded at the Caley-Hove unconformity

Dorado Canyon PlayW18-4 Caley

shelf prospects

So where next?W18-4 Caleyshelf prospects

Girt by undrilled sedimentary section

Total depth ofsection drilled

NWS Inset Map

Cross Section across AustraliaLeft side Right side

Total depth ofsection drilled

Depth to Proterozoic Basement

Depth (m)

1000km

500km

Girt by undrilled sedimentary section

NWS Inset Map

Cross Section across AustraliaLeft side Right side

Depth to Proterozoic Basement

Total depth ofsection drilled

Isopach of undrilled section

Dorado283 Mmboe (2C)2

(Depth ~4000 m)

Dorado283 Mmboe (2C)2

(Depth ~4000 m)

Isopach (m)

Isopach of undrilled section

Isopach (m)

1000km

1 - AWE ASX announcement 21st February 20182 - CVN ASX announcement 20th August 2018

Waitsia1339 BScf GIIP (P50)1

(Depth ~3200 m)

Girt by undrilled sedimentary section

‘Australia is a country that is at once staggeringly empty and yet

packed with stuff. Interesting stuff, ancient stuff, stuff not readily

explained. Stuff yet to be found’

Isopach (m)

Isopach of undrilled section

Bill Bryson, In a Sunburned Country

1000km

Dorado283 Mmboe (2C)2

(Depth ~4000 m)

1 - AWE ASX announcement 21st February 20182 - CVN ASX announcement 20th August 2018

Waitsia1339 BScf GIIP (P50)1

(Depth ~3200 m)